{	Problem: http://codeforces.ru/problemset/problem/104/A
	Verdict: Accepted
}
var
        n,ans:longint;

begin 
read(n);
dec(n,10);
if n = 10 then ans := 15 else 
if n = 11 then ans := 4 else
if (n < 1) or (n > 11) then ans := 0 else ans := 4;
write(ans);
end.